Coffee-mill



(No Model.)

H. KALMBAGH' COFFEE MILL.

No. 581,729. Patented May 4,1897.

INVENTOR WITNESSES Nirnn Tarts HERMAN KALMBACH, OF FRANCISCO, MICHIGAN.

COFFEE-MILL.

SPECIFICATION forming part of Letters Patent No. 581 ,729, dated May 4,1897.

Application filed November 23, 1895. Serial No. 569,922. (No model.)

To all whom it may concerw Be it known that I, HERMAN KALMBACH, acitizen of the United States, residing at Francisco, county of Jackson,State of Michigan, have invented a certain new and useful I1nprovementin Coffee-Mills; and I declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it pertains to make and use the same, referencebeing had to the accompanying drawings, which form a part of thisspecification.

My invention relates to coffee-mills, and its object is to provideimproved means for first crushing and then grinding the coffee.

My invention is shown in the accompanying drawings, in which Figure 1 isa vertical cross-sectional view. Fig. 2 is a view showing the box andbearings in horizontal section and a plan of the rolls and gears. Fig. 3is a view showing the concave grates.

In the drawings, A is the hopper, and B the shell or boX, of themachine.

B is a drawer or box to receive the ground coffee.

C C are rolls having spiral corrugations c 0. These rolls are mounted inthe frame, one be ing driven by the hand and balance-wheel D and theother driven in the opposite direction through the gears cl CZ. The gear(Z is made larger than the gear (1, by means of which the roll C isdriven at a higher speed than the other roll. By means of thesediiferences in speed the grinding action is created between the tworolls in addition to the ordinary action of crushing the berry.

E E are concave grates or grinders, preferably cast in one piece. Thesegrates are concave to fit the rolls and are located immediately belowand near enough to the rolls to grind the broken coffee-berries as theycome from between the rolls. These grates are provided with longitudinalgrinding edges, preferably made straight as compared with the spiralcorrugations on the rolls. The combination of these straight edges orcorrugations 011 the grates or grinders and the spiral corrugations 011the rolls produces a running action between them.

Any suitable means may be employed for adjusting the rolls to or fromone another or to and from the grates, and as such adjustments arecommon they need not be shown or described. For all practical purposesmills may be made without any adj ustment, thereby cheapening theirproduction.

The grates are provided with openings 8 2, through which the finerparticles of coffee pass, leaving the coarser grains to be deliveredover the outer edges of the grates.

The advantages of my invention are found in its simplicity ofconstruction and the effectiveness of its operation.

Vhat I claim is-- In a coffee-grinding mill, the combination of thecrushing-rolls C and C driven at varying rates of speed and havinglongitudinal spiral corrugations c, the'corrugations of each roll beingspiraled reversely to the other, of the grates E, located immediatelyunder, and concaved to fit, the rolls C and C; the said grates beingprovided with longitudinal grinding edges, and having openings (2 forthe passage of the article ground, substantially as and for the purposeset forth.

In testimony whereof I sign this specification in the presence of twowitnesses.

HERMAN KALMBACII. lVitnesses:

E. A. CAREY,

W. Anno'r'r.

